Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Washer structure – Including means for retaining washer to fastener
Patent
1995-08-23
1997-04-15
Meyers, Steven N.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Washer structure
Including means for retaining washer to fastener
411162, 411163, 411165, 439433, 439434, F16B 3924, H01R 426
Patent
active
056202903
ABSTRACT:
A snap-on ground retainer for a fastener of the type having a shank, the shank having a head at one end and a threaded portion along its length. The ground retainer comprises a relatively thin sheet metal and includes a washer-like member having an external annular body portion and an inner tooth portion, the inner tooth portion comprises a plurality of circumferentially spaced teeth extending radially inwardly from an inner margin of the washer-like member. The plurality of circumferentially spaced teeth comprise a plurality of resilient retaining teeth and a plurality of rigid grounding teeth, an inner diameter defined by the rigid grounding teeth is slightly larger than a maximum diameter of the threaded portion on the fastener and an inner diameter defined by the resilient retaining teeth is slightly smaller than a maximum diameter of the threaded portion on the fastener with which the ground retainer is adapted to be telescopically associated. The resilient retaining teeth are deflectable for permitting passage of the ground retainer over the threaded portion onto the fastener to seat on the shank and are rigid enough to prevent the ground retainer from being easily detached from the fastener, wherein the ground retainer is attached to the fastener after the threaded portion of the fastener has been inserted through an apertured plate member thereby preventing dislodgment of the fastener from the plate member. The rigid grounding teeth are twisted to enable them to engage with an adjacent upper surface and an adjacent lower surface when the fastener is tightly secured to the lower surface thereby creating and maintaining an electrical connection between the upper and lower surfaces.
REFERENCES:
patent: 1547162 (1925-08-01), Bohlman
patent: 1784142 (1930-12-01), Hasking
patent: 1924695 (1933-08-01), Olson
patent: 1963800 (1934-06-01), Olson
patent: 2250050 (1941-07-01), Olson
patent: 2297261 (1942-09-01), Thode
patent: 2342910 (1944-08-01), Tinnerman
patent: 2492115 (1949-06-01), Crowther
patent: 2541096 (1951-04-01), Poupitch
patent: 2631633 (1953-03-01), Peckham
patent: 2747166 (1958-12-01), Hoffarth
Homfeldt Kent
Langford James
Leatherman Barth
Illinois Tool Works Inc.
Meyers Steven N.
Santos Robert G.
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